Debian GNU/Linux 11 syzkaller ttyS0 Warning: Permanently added '[localhost]:64395' (ECDSA) to the list of known hosts. 2021/12/06 11:22:45 fuzzer started 2021/12/06 11:22:46 dialing manager at localhost:35719 2021/12/06 11:22:46 checking machine... 2021/12/06 11:22:46 checking revisions... syzkaller login: [ 37.191899] kmemleak: Automatic memory scanning thread ended 2021/12/06 11:22:46 testing simple program... [ 37.240791] cgroup: Unknown subsys name 'net' [ 37.241632] cgroup: Unknown subsys name 'net_prio' [ 37.243229] cgroup: Unknown subsys name 'devices' [ 37.244233] cgroup: Unknown subsys name 'blkio' [ 37.289296] [ 37.289582] ========================= [ 37.290050] WARNING: held lock freed! [ 37.290512] 5.16.0-rc3-next-20211203 #1 Not tainted [ 37.291192] ------------------------- [ 37.291671] kworker/1:1/31 is freeing memory ffff88800f4f4400-ffff88800f4f45ff, with a lock still held there! [ 37.292946] ffff88800f4f4548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 37.294108] 3 locks held by kworker/1:1/31: [ 37.294650] #0: ffff8880080a6138 ((wq_completion)cgroup_destroy){+.+.}-{0:0}, at: process_one_work+0x929/0x1710 [ 37.296025] #1: ffff888009627da8 ((work_completion)(&(&css->destroy_rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x95d/0x1710 [ 37.297501] #2: ffff88800f4f4548 (&root->kernfs_rwsem){++++}-{3:3}, at: __kernfs_remove+0x627/0xb00 [ 37.298670] [ 37.298670] stack backtrace: [ 37.299254] CPU: 1 PID: 31 Comm: kworker/1:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 37.300357] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 37.301973] Workqueue: cgroup_destroy css_free_rwork_fn [ 37.302762] Call Trace: [ 37.303120] [ 37.303408] dump_stack_lvl+0x8b/0xb3 [ 37.303905] debug_check_no_locks_freed.cold+0xa5/0xb1 [ 37.304563] ? kernfs_put.part.0+0x334/0x540 [ 37.305127] kfree+0xb3/0x5a0 [ 37.305523] ? kmem_cache_free+0xce/0x640 [ 37.306047] kernfs_put.part.0+0x334/0x540 [ 37.306585] kernfs_put+0x42/0x50 [ 37.307087] __kernfs_remove+0x7ce/0xb00 [ 37.307577] ? lock_is_held_type+0xd7/0x130 [ 37.308911] ? kernfs_next_descendant_post+0x2f0/0x2f0 [ 37.309578] ? down_write+0xde/0x150 [ 37.310046] ? down_write_killable_nested+0x180/0x180 [ 37.310695] kernfs_destroy_root+0x89/0xb0 [ 37.311369] css_free_rwork_fn+0xa28/0xf40 [ 37.311907] process_one_work+0xa30/0x1710 [ 37.312434] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 37.313034] ? rwlock_bug.part.0+0x90/0x90 [ 37.313553] ? _raw_spin_lock_irq+0x41/0x50 [ 37.314131] worker_thread+0x62a/0x13e0 [ 37.314739] ? process_one_work+0x1710/0x1710 [ 37.315739] kthread+0x40c/0x500 [ 37.316196] ? set_kthread_struct+0x130/0x130 [ 37.316870] ret_from_fork+0x22/0x30 [ 37.317413] [ 37.317824] ================================================================== [ 37.319672] BUG: KASAN: use-after-free in up_write+0x3ac/0x460 [ 37.320496] Read of size 8 at addr ffff88800f4f4540 by task kworker/1:1/31 [ 37.321515] [ 37.321850] CPU: 1 PID: 31 Comm: kworker/1:1 Not tainted 5.16.0-rc3-next-20211203 #1 [ 37.323154] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [ 37.324937] Workqueue: cgroup_destroy css_free_rwork_fn [ 37.325766] Call Trace: [ 37.326118] [ 37.326401] dump_stack_lvl+0x8b/0xb3 [ 37.327090] print_address_description.constprop.0+0x1f/0x180 [ 37.328218] ? up_write+0x3ac/0x460 [ 37.328826] ? up_write+0x3ac/0x460 [ 37.329272] kasan_report.cold+0x7f/0x11b [ 37.329991] ? up_write+0x3ac/0x460 [ 37.330718] up_write+0x3ac/0x460 [ 37.332128] css_free_rwork_fn+0xa28/0xf40 [ 37.332950] process_one_work+0xa30/0x1710 [ 37.333485] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 37.334076] ? rwlock_bug.part.0+0x90/0x90 [ 37.334605] ? _raw_spin_lock_irq+0x41/0x50 [ 37.335186] worker_thread+0x62a/0x13e0 [ 37.335682] ? process_one_work+0x1710/0x1710 [ 37.336282] kthread+0x40c/0x500 [ 37.336714] ? set_kthread_struct+0x130/0x130 [ 37.337280] ret_from_fork+0x22/0x30 [ 37.337749] [ 37.338077] [ 37.338278] Allocated by task 282: [ 37.338721] kasan_save_stack+0x1e/0x40 [ 37.339245] __kasan_kmalloc+0x81/0xa0 [ 37.339719] kernfs_create_root+0x4c/0x410 [ 37.340283] cgroup_setup_root+0x346/0xb60 [ 37.340833] cgroup1_get_tree+0xc1b/0x1370 [ 37.341354] vfs_get_tree+0x8e/0x2f0 [ 37.341837] path_mount+0x131b/0x1f80 [ 37.342335] __x64_sys_mount+0x27e/0x300 [ 37.342854] do_syscall_64+0x3b/0x90 [ 37.343314] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 37.343975] [ 37.344173] Freed by task 31: [ 37.344546] kasan_save_stack+0x1e/0x40 [ 37.345032] kasan_set_track+0x21/0x30 [ 37.345506] kasan_set_free_info+0x20/0x30 [ 37.346073] __kasan_slab_free+0x108/0x170 [ 37.346593] kfree+0xc5/0x5a0 [ 37.347026] kernfs_put.part.0+0x334/0x540 [ 37.347547] kernfs_put+0x42/0x50 [ 37.348017] __kernfs_remove+0x7ce/0xb00 [ 37.348514] kernfs_destroy_root+0x89/0xb0 [ 37.349065] css_free_rwork_fn+0xa28/0xf40 [ 37.349585] process_one_work+0xa30/0x1710 [ 37.350151] worker_thread+0x62a/0x13e0 [ 37.350642] kthread+0x40c/0x500 [ 37.351107] ret_from_fork+0x22/0x30 [ 37.351567] [ 37.351791] The buggy address belongs to the object at ffff88800f4f4400 [ 37.351791] which belongs to the cache kmalloc-512 of size 512 [ 37.353291] The buggy address is located 320 bytes inside of [ 37.353291] 512-byte region [ffff88800f4f4400, ffff88800f4f4600) [ 37.354762] The buggy address belongs to the page: [ 37.355390] page:000000006910ff4f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xf4f4 [ 37.356553] head:000000006910ff4f order:2 compound_mapcount:0 compound_pincount:0 [ 37.357465] flags: 0x100000000010200(slab|head|node=0|zone=1) [ 37.358214] raw: 0100000000010200 dead000000000100 dead000000000122 ffff888007841c80 [ 37.359185] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 37.360162] page dumped because: kasan: bad access detected [ 37.360876] [ 37.361075] Memory state around the buggy address: [ 37.361662] ffff88800f4f4400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.362550] ffff88800f4f4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.363478] >ffff88800f4f4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.364398] ^ [ 37.365084] ffff88800f4f4580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.366003] ffff88800f4f4600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 37.366917] ================================================================== [ 37.402115] cgroup: Unknown subsys name 'hugetlb' [ 37.403002] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 11:22:46 Registers: info registers vcpu 0 RAX=ffffffff84078af0 RBX=ffffffff85032600 RCX=ffffffff8405abe1 RDX=ffffed100d9c7143 RSI=0000000000000001 RDI=ffffffff84078eaf RBP=0000000000000000 RSP=ffffffff85007e40 R8 =0000000000000000 R9 =ffff88806ce38a13 R10=ffffed100d9c7142 R11=0000000000000001 R12=fffffbfff0a064c0 R13=ffffffff858bd8d0 R14=0000000000000000 R15=dffffc0000000000 RIP=ffffffff84078afb RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 ffff88806ce00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=0000561e1cfacf60 CR3=00000000092d8000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 YMM00=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM01=0000000000000000 0000000000000000 7465677261742e79 636e656772656d65 YMM02=0000000000000000 0000000000000000 ffffffffffffffff 0f0e0d0c0b0a0908 YMM03=0000000000000000 0000000000000000 0000000000000073 66626c7465677568 YMM04=0000000000000000 0000000000000000 2e2e2e2e2e2e2e2e 2e2e2e2e2e2e2e2e YMM05=0000000000000000 0000000000000000 396633353937322d 353330382d636539 YMM06=0000000000000000 0000000000000000 0000000000000000 6c6562616c636573 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 6564636261393837 3635343332313040 YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM10=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM14=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000000 info registers vcpu 1 RAX=dffffc0000000060 RBX=00000000000003fd RCX=0000000000000000 RDX=00000000000003fd RSI=ffffffff8236405c RDI=ffffffff87381a60 RBP=ffffffff87381a20 RSP=ffff888009627668 R8 =0000000000000025 R9 =0000000000000033 R10=ffffffff8234ae1b R11=000000000000000a R12=0000000000000020 R13=fffffbfff0e70397 R14=fffffbfff0e7034e R15=dffffc0000000000 RIP=ffffffff823640b0 RFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 0000000000000000 00000000 00000000 GS =0000 ffff88806cf00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007fffe41a8990 CR3=0000000017146000 CR4=00350ee0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 YMM00=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM01=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM03=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM04=0000000000000000 0000000000000000 ffffffffffffffff ffffffffffffffff YMM05=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM06=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM08=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM10=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM13=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM14=0000000000000000 0000000000000000 0000000000000000 0000000000000000 YMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000000